Personally I choose the last option...WHY?
Simply because I find nothing romantic about Rudra desparately seeking Paro in Myrah. I see nothing romantic in him kissing Myrah because he is desparately trying to live and feel Paro in Myrah. I see nothing romantic about Rudra being civil with Myrah AFTER making Myrah and Paro a "1 embodiment entity" in his mind. I see nothing romantic in Myrah hoping for a passionate love from Rudra while she forgets about the reality of her engagement because that "love" does not exist for her.
As for solace? What solace will there be ever for Rudra if Myrah remains Myrah? Will it change the fact for him that indeed he did get late on that fateful night? Will it change the fact for Rudra that despite him saving Myrah...he will not be guilt free coz he did lose his Paro?
What solace will there be for Rudra if let's say he "moves on" with Myrah? Is that really a move on when consciously you have separated Myrah from Paro but subconsciously you shall always seek Paro in Myrah?
What solace will there be for Myrah if she agrees to be with Rudra after knowing she is Paro's look alike? The solace that she loves him but he probably loves her face and his twisted thinking that she is his Paro's reformation? Will Myrah ever be able to maintain her own individuality as a person after that? Will she ever be able to keep her identity as Myrah for both Rudra and Dhruv who seek their deceased wife and mother respectively?
The answer to all the above is NO.
That leaves me with the last option only...Psychological Tragedy!
I wont shy from saying this that I agree with _SenbonZakura_ that Rudra is nothing short of needing a psychiatrist at this point. When a person comes to a point when the lines between what is real and what is not begin to diminish to an extent where you start living what is not real...you are nothing short of needing serious therapy. If Myrah (assuming makers keep Myrah=Myrah) jumps into this whirlpool along with Rudra fully aware of what is reality...then she is headed in the same direction because she will be making conscious efforts to win Rudra and Dhruv on her own merits...which will never be possible atleast until she remains a look alike of Paro. TBH...its quite a horrifically messed up situation psychologically when "move on" is based on look alikes simply because the look alike cannot represent "Hope"..."Solace" ..."Happiness"..."Reassurance"...or "Comfort". They rather represent twisted "Destruction"..."Terrifying Horror"..."Lifetime Delusional Behavior" and "Psychotic Remedy".
I don't know where we are headed at this point but I do want to mention that I have never been against "move on" as much as I maybe this time and its all due to romanticizing of this "move on" strategy with a lookalike. Rudra is completely entitled to live a new life...new hope...and it all is void and null if it is to happen with Myrah is she is not Paro simply because there is no "move on" at all. There is no hope for Rudra to let go of his guilt or let go of his Paro as he will only end up reliving her in Myrah not really accepting Myrah for Myrah...at a subconsious level.
At this point I have nothing but deep sympathy and gut wrenching feelings for Myrah...Rudra and Dhruv. Oh what a Psychological Tragedy it is!!!!!
EDIT:
I see Napster "like" my post and apart from being overly overwhelmed with happiness, I would request her to say a few words either here or a new post on what her views are regarding this situation. Her "like" has given me more confidence (not that I didn't have any but reactions from some people began to creep doubts in me) that my thinking of why this storyline is not workable is not wrong afterall.
Please Naps ji...if only I could have to pleasure to read ur take.